Red European's top supporter
I believe the answer is:
tent-pole
'top supporter' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'red european's' is the wordplay.
'red' becomes 'tent' (I can't justify this - if you can you should believe this answer much more).
'european' becomes 'pole' (Pole is an example).
'tent'+'pole'='TENT-POLE'
Can you help me to learn more?
(Other definitions for tent-pole that I've seen before include "Canvas supporter" , "Support for canvas" .)